基于土壤水分特征曲线的北京市废弃关停矿山修复效果研究

Research on Restoration Effectiveness of Abandoned Mine in Beijing Mountainous Area based on Characteristic Curve of Soil Moisture

通过测定和分析北京市废弃关停矿山4个矿区3种立地类型的土壤水分特征曲线及土壤物理指标表明,经验方程θ=aS-b对北京市废弃关停矿山的土壤水分特征曲线有良好的模拟性,土壤有效水的上限(田间持水量)为0.01 MPa土壤水吸力所对应的土壤湿度,易有效水和难有效水的土壤水吸力界点以0.1 MPa为宜。从a值和ab值比较北京市废弃关停矿山土壤的持水性能和供水性能为:未被干扰区域>修复区域>被破坏区域。

Soil moisture characteristic curves and soil physical properties from 4 sites including three types of abandoned mine in Beijing mountainous area were tested. The results showed that the empirical equation 0 =aS-b could well sim ulate the soil moisture characteristic curve of abandoned mine in Beijing mountainous area. The upper limit of available water （field moisture capacity） was the soil moisture content corresponding to the suction of 0.01 MPa. It was suitable to take 0.1 MPa as the boundary point of suction for readily available water and resistant available water. Through comparison of capacity of soil water retention and supplement with a and ab value of abandoned mine in Beijing mountainous area, the result was： undisturbed region〉restore region〉destroy region.